Removable strip provides clean and quick seal upon contact. FSC Certified®. Security Artline. White Wove, open side. Side Seam. 24 lb. #9. 3-7/8" x 8-7/8". Top Window Size: 1-3/16" x 3-1/2". Top Window Placement: 2" from bottom. Bottom Window Size: 1" x 4". Bottom Window Placement: 1/2" from bottom. 500 per box.